Piezoelectric driving device and piezoelectric driving system having the same

Abstract

A piezoelectric driving device comprising: a frame including a deformable portion, the deformable portion including a first side arm, a second side arm opposite the first side arm, and a bottom arm connecting the first side arm and the second side arm, the first side arm and the second side arm being inclined relative to each other with respect to the bottom arm; a first piezoelectric element and a second piezoelectric element, the first piezoelectric element being provided between the frame and the first side arm of the deformable portion and the second piezoelectric element being provided between the frame and the second side arm of the deformable portion, the first piezoelectric element and the second piezoelectric element being configured to deform the deformable portion; and an actuating portion provided on the bottom arm of the deformable portion and configured to move when driven by deformation of the deformable portion.

Description

[Technical field]

[0001] The present disclosure relates to the field of piezoelectric driving technology, and more particularly to a piezoelectric driving device and a piezoelectric driving system having the same. [Background technology]

[0002] In the related art, there are usually two types of piezoelectric drive systems. One is the USM type and the other is the SIDM type. The USM type piezoelectric drive system is complex and expensive, and the stroke generated is very small. Meanwhile, the SIDM type piezoelectric drive system requires a counterweight and an axis, so the structure is complicated. In addition, the control method of the SIDM type piezoelectric drive system is very difficult because it needs to accurately control the deformation speed of the piezoelectric element. Summary of the Invention [Problem to be solved by the invention]

[0003] Therefore, there is a need to propose a piezoelectric driving device and a piezoelectric driving system to solve at least one of the above technical problems in the related art. [Means for solving the problem]

[0004] Therefore, an embodiment of a first aspect of the present disclosure provides a piezoelectric drive device, the device including: a frame including a deformable portion, the deformable portion including a first side arm, a second side arm opposite the first side arm, and a bottom arm connecting the first side arm and the second side arm, the first side arm and the second side arm being inclined to each other with respect to the bottom arm; a first piezoelectric element and a second piezoelectric element, the first piezoelectric element being provided between the frame and the first side arm of the deformable portion and the second piezoelectric element being provided between the frame and the second side arm of the deformable portion, the first piezoelectric element and the second piezoelectric element being configured to deform the deformable portion; and an actuation portion provided on the bottom arm of the deformable portion and configured to move by driving the deformation of the deformable portion.

[0005] In some embodiments, the first piezoelectric element has a first end connected to the frame and a second end connected to the first side arm of the deformable portion, the first piezoelectric element being configured to expand or contract to deform the deformable portion, and the second piezoelectric element has a first end connected to the frame and a second end connected to the second side arm of the deformable portion, the second piezoelectric element being configured to expand or contract to deform the deformable portion.

[0006] In some embodiments, a second end of the first piezoelectric element matches in shape and orientation with the first side arm of the deformable portion, a second end of the second piezoelectric element matches in shape and orientation with the second side arm of the deformable portion, a direction perpendicular to the first side arm of the deformable portion intersects with the extension direction of the bottom arm of the deformable portion at a first angle, and a direction perpendicular to the second side arm of the deformable portion intersects with the extension direction of the bottom arm of the deformable portion at a second angle.

[0007] In some embodiments, the frame further includes a main body and a first side and a second side extending from opposite ends of the main body, wherein the deformable portion extends from a central portion of the main body and is located between the first side and the second side, the deformable portion forms a first gap and a second gap with the first side and the second side, respectively, the first piezoelectric element is disposed in the first gap and the second piezoelectric element is disposed in the second gap, a first end of the first piezoelectric element is connected to the first side and a first end of the second piezoelectric element is connected to the second side.

[0008] In some embodiments, a first end of the first side arm and a first end of the second side arm are connected to the main body, the bottom arm is connected between a second end of the first side arm and a second end of the second side arm, the first end of the first side arm and the first end of the second side arm are separated by a first distance in an extension direction of the bottom arm, and the second end of the first side arm and the second end of the second side arm are separated by a second distance in an extension direction of the bottom arm, and the first distance is shorter than the second distance such that the deformable portion has a generally triangular shape or a generally "A" shaped shape.

[0009] In some embodiments, a first groove is formed at a connection between the first side arm and the body, a second groove is formed at a connection between the second side arm and the body, a third groove is formed at a connection between the first side arm and the bottom arm, and a fourth groove is formed at a connection between the second side arm and the bottom arm.

[0010] In some embodiments, there are two actuating portions disposed at the second end of the first side arm and the second end of the second side arm, respectively, or there are two actuating portions disposed on the bottom arm and adjacent the second end of the first side arm and the second end of the second side arm, respectively.

[0011] In some embodiments, the two working parts are symmetrical with respect to a center line of the bottom arm perpendicular to an extension direction of the bottom arm.

[0012] In some embodiments, there is one actuating portion provided on the bottom arm, preferably at the center of the surface of the bottom wall.

[0013] In some embodiments, the actuating portion protrudes from the bottom arm of the deformable portion and has a part-spherical shape.

[0014] In some embodiments, the first piezoelectric element and the second piezoelectric element are configured to operate in a d33 mode.

[0015] In some embodiments, a first angle range between a direction perpendicular to the first side arm of the deformable portion and an extension direction of the bottom arm of the deformable portion is between 24 degrees and 26 degrees, and a second angle range between a direction perpendicular to the second side arm of the deformable portion and an extension direction of the bottom arm of the deformable portion is between 24 degrees and 26 degrees.

[0016] In some embodiments, the deformable portion is set in a central portion of the frame and has a symmetrical structure, the first side arm and the second side arm are symmetrical to each other, the first piezoelectric element is symmetrical to the second piezoelectric element with respect to an axis of symmetry of the deformable portion, and the first angle and the second angle are equal.

[0017] In some embodiments, the frame is formed from a ceramic material, the actuation portion is formed from a ceramic material, and the deformable portion of the frame is integrally formed with the actuation portion.

[0018] In some embodiments, the first piezoelectric element is bonded to the frame and to the deformable portion, and the second piezoelectric element is bonded to the frame and to the deformable portion.

[0019] A piezoelectric drive system provided by a second aspect embodiment of the present disclosure includes a piezoelectric drive device according to any of the above embodiments, a movable member configured to engage with the actuating portion of the piezoelectric drive device and move when driven by the actuating portion, and a retaining spring provided on the piezoelectric drive device and configured to hold the piezoelectric drive device so as to press the actuating portion against the movable member.

[0020] In the piezoelectric drive device and the piezoelectric drive system according to the embodiment of the present disclosure, when the first piezoelectric element or the second piezoelectric element is energized, the first piezoelectric element or the second piezoelectric element expands, and the deformable part deforms accordingly, driving the actuating part to move in the corresponding direction, whereby the actuating part cooperates with the movable member to drive the movable member to move in the desired direction. Furthermore, when the first piezoelectric element or the second piezoelectric element is powered off, the first piezoelectric element or the second piezoelectric element contracts, and the deformable part returns to its initial shape, so that the movable member is not affected and the actuating part also returns to its initial position. By repeating this manner, the movable member can be continuously moved in the desired direction.

[0021] Therefore, the piezoelectric drive device and the piezoelectric drive system according to the embodiments of the present disclosure have advantages such as a simple structure, easy control, and high drive efficiency.

[0022] Described in this disclosure Piezoelectric drive device and piezoelectric drive system Other advantages, objects and features of the will be set forth in part in the description which follows, and in part will be learned by those skilled in the art based on study and practice of the present disclosure. [Brief description of the drawings]

[0023] The above and / or additional aspects and advantages of the present disclosure will become apparent and easier to understand from the following description of the exemplary embodiments taken in conjunction with the drawings. [Figure 1] 1 is a schematic diagram of a piezoelectric driving device according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is an enlarged view of a portion A in FIG. [Diagram 3]FIG. 1 is a schematic diagram of a piezoelectric drive system according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, the embodiments of the present disclosure will be described in detail, and examples of the embodiments are illustrated in the accompanying drawings, in which the same or similar reference numerals throughout indicate the same or similar elements, or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of illustrating the present application, and should not be understood as limitations on the present application.

[0025] In the description of the present disclosure, the orientations or positional relationships indicated by terms such as "center", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", and "circumferential" should be understood as orientations or positional relationships shown based on the drawings. These are merely for the purpose of explaining and simplifying the present disclosure, and are not intended to indicate or imply that the devices or elements shown necessarily have a specific orientation, or are constructed and operated according to a specific orientation. As such, they should not be understood as limitations on the present disclosure.

[0026] A piezoelectric driving device 100 according to an embodiment of the present disclosure will be described with reference to the drawings.

[0027] As shown in FIG. 1 and FIG. 2, the piezoelectric driving device 100 includes a frame 1, a first piezoelectric element 21, a second piezoelectric element 22, and an actuation portion 31. The frame 1 includes a deformable portion 13. The deformable portion 13 includes a first side arm 131, a second side arm 132 facing the first side arm 131, and a bottom arm 133 connecting the first side arm 131 and the second side arm 132, and the first side arm 131 and the second side arm 132 are inclined to each other with respect to the bottom arm 133. The first piezoelectric element 21 is provided between the frame 1 and the first side arm 131 of the deformable portion 13, and the second piezoelectric element 22 is provided between the frame 1 and the second side arm 132 of the deformable portion 13, and both the first piezoelectric element 21 and the second piezoelectric element 22 are configured to deform the deformable portion 13. The actuating portion 31 is provided on the bottom arm 133 of the deformable portion 13 and is configured to move when the deformable portion 13 is driven to deform.

[0028] 1 , the frame 1 extends horizontally, a first piezoelectric element 21 and a second piezoelectric element 22 are connected to the frame 1 and spaced apart from each other, the first piezoelectric element 21 is located at the left end of the frame 1, the second piezoelectric element 22 is located at the right end of the frame 1, and the deformable portion 13 is located between the first piezoelectric element 21 and the second piezoelectric element 22. The first piezoelectric element 21 and the second piezoelectric element 22 are both connected to the deformable portion 13. The actuating portion 31 is provided on the bottom arm of the deformable portion 13.

[0029] It should be noted that the terms "left" and "right" used herein represent orientations in the drawings and are intended to facilitate understanding of the present disclosure and are not to be construed as limitations on the present disclosure.

[0030] In the piezoelectric driving device according to the embodiment of the present disclosure, when the first piezoelectric element 21 or the second piezoelectric element 22 is energized, the first piezoelectric element 21 or the second piezoelectric element 22 expands, and the deformable portion 13 deforms accordingly to drive the actuating portion 31 to move in the corresponding direction, whereby the actuating portion 31 can cooperate with the movable member 5 of the piezoelectric driving system 1000 to drive the movable member 5 to move in a desired direction. Furthermore, when the first piezoelectric element 21 or the second piezoelectric element 22 is powered off, the first piezoelectric element 21 or the second piezoelectric element 22 contracts, and the deformable portion 13 recovers to its initial shape, whereby the actuating portion 31 also recovers to its initial position without affecting the movable member 5. By repeating this manner, the movable member 5 can be continuously moved in a desired direction.

[0031] Therefore, the piezoelectric driving device 100 according to the embodiment of the present disclosure has the advantages of a simple structure, easy control, and high driving efficiency.

[0032] In some embodiments of the present disclosure, the first piezoelectric element 21 has a first end connected to the frame 1 and a second end connected to the first side arm 131 of the deformable portion 13 and is configured to expand or contract to deform the deformable portion 13. The second piezoelectric element 22 has a first end connected to the frame 1 and a second end connected to the second side arm 132 of the deformable portion 13 and is configured to expand or contract to deform the deformable portion 13.

[0033] Furthermore, the second end of the first piezoelectric element 21 matches in shape and orientation with the first side arm 131 of the deformable part 13, and the second end of the second piezoelectric element 22 matches in shape and orientation with the second side arm 132 of the deformable part 13. For example, the second end of the first piezoelectric element 21 has a flat end face parallel to the flat outer surface of the first side arm 131 of the deformable part 13, and the second end of the second piezoelectric element 22 has a flat end face parallel to the flat outer surface of the second side arm 132 of the deformable part 13.

[0034] In addition, since the first side arm 131, the second side arm 132, and the bottom arm 133 of the deformable portion 13 form a closed cavity, "inside" with respect to the deformable portion 13 here refers to toward the cavity, and "outside" with respect to the deformable portion 13 here refers to away from the cavity.

[0035] Furthermore, a direction perpendicular to the first side arm 131 of the deformable part 13 and an extension direction of the bottom arm 133 of the deformable part 13 intersect at a first angle θ1, and a direction perpendicular to the second side arm 132 of the deformable part 13 and an extension direction of the bottom arm 133 of the deformable part 13 intersect at a second angle θ2. As shown in Fig. 1, the extension direction of the bottom arm 133 is horizontal.

[0036] In some embodiments of the present disclosure, the first angle θ1 between the direction perpendicular to the first side arm 131 of the deformable portion 13 and the extension direction of the bottom arm 133 of the deformable portion 13 ranges from 24 degrees to 26 degrees, and the second angle θ2 between the direction perpendicular to the second side arm 132 of the deformable portion 13 and the extension direction of the bottom arm 133 of the deformable portion 13 ranges from 24 degrees to 26 degrees.

[0037] For example, the first angle θ1 may be 24 degrees, 24.5 degrees, 25 degrees, 25.5 degrees or 26 degrees, and the second angle θ2 may be 24 degrees, 24.5 degrees, 25 degrees, 25.5 degrees or 26 degrees.

[0038] Preferably, the first angle θ1 is 25 degrees and the second angle θ2 is 25 degrees.

[0039] Since the first angle θ1 and the second angle θ2 are in the range of 24 degrees to 26 degrees, the movable member 5 of the piezoelectric drive system 1000 can move stably and smoothly, and the piezoelectric drive device 100 can achieve high drive efficiency.

[0040] 1, the deformable part 13 is disposed in the center of the frame 1 and has a symmetrical structure, i.e., the first side arm 131 is symmetrical to the second side arm 132. Then, the first piezoelectric element 21 is symmetrical to the second piezoelectric element 22 with respect to the symmetry axis of the deformable part 13, and the first angle θ1 is equal to the second angle θ2.

[0041] Therefore, the overall structure of the piezoelectric driving device 100 is stable and has high strength, so that the movable member 5 of the piezoelectric driving system 1000 can be driven to move stably and smoothly.

[0042] In some embodiments of the present disclosure, the first piezoelectric element 21 and the second piezoelectric element 22 are configured to operate in d33 mode, where d33 mode means that the piezoelectric material has the same polarization direction and deformation direction. In other words, the polarization direction of the first piezoelectric element 21 coincides with the deformation direction of the first piezoelectric element 21, both directions being perpendicular to the first side arm 131 of the deformable part 13. Similarly, the polarization direction of the second piezoelectric element 22 coincides with the deformation direction of the second piezoelectric element 22, both directions being perpendicular to the second side arm 132 of the deformable part 13.

[0043] In some embodiments of the present disclosure, the frame 1 further includes a body 15, a first side 11, and a second side 12. The first side 11 and the second side 12 extend from opposite ends of the body 15, respectively. The deformable portion 13 extends from a center of the body 15 and is located between the first side 11 and the second side 12. The deformable portion 13 forms a first gap and a second gap with the first side 11 and the second side 12, respectively. A first piezoelectric element 21 is disposed in the first gap, and a second piezoelectric element 22 is disposed in the second gap. A first end of the first piezoelectric element 21 is connected to the first side 11, and a first end of the second piezoelectric element 22 is connected to the second side 12.

[0044] In some preferred embodiments of the present disclosure, the body 15, the deformable portion 13, the first side 11 and the second side 12 are integral, therefore, they can be easily manufactured and have improved structural strength.

[0045] As shown in FIG. 1 , the frame 1 includes a horizontally extending main body 15, a first side 11 is provided at the left end of the main body 15, a second side 12 is provided at the right end of the main body 15, and a deformable portion 13 is located between the first side 11 and the second side 12.

[0046] The first piezoelectric element 21 is located between the first side 12 and the deformable portion 13. A first end of the first piezoelectric element 21 is a left end of the first piezoelectric element 21, and a second end of the first piezoelectric element 21 is a right end of the first piezoelectric element 21. The left end of the first piezoelectric element 21 is connected to the first side 11, and the right end of the first piezoelectric element 21 is connected to the first side arm 131 of the deformable portion 13.

[0047] The second piezoelectric element 22 is located between the second side 12 and the deformable portion 13. A first end of the second piezoelectric element 22 is a right end of the second piezoelectric element 22 and a second end of the second piezoelectric element 22 is a left end of the second piezoelectric element 22. The left end of the second piezoelectric element 22 is connected to the second side arm 132 of the deformable portion 13 and the right end of the second piezoelectric element 22 is connected to the second side 12.

[0048] Thus, when the first piezoelectric element 21 is energized to expand in a direction perpendicular to the first side arm 131 of the deformable portion 13, the first side portion 11 restricts the movement of the left end of the first piezoelectric element 21 such that the right end of the first piezoelectric element 21 presses against the deformable portion 13 in a direction perpendicular to the first side arm 131 of the deformable portion 13, causing the deformable portion 13 to deform accordingly. Similarly, when the second piezoelectric element 22 is energized to expand in a direction perpendicular to the second side arm 132 of the deformable portion 13, the second side portion 12 restricts the movement of the right end of the second piezoelectric element 22 such that the left end of the second piezoelectric element 22 presses against the deformable portion 13 in a direction perpendicular to the second side arm 132 of the deformable portion 13, causing the deformable portion 13 to deform accordingly.

[0049] In some embodiments, as shown in FIG. 1, the left surface of the first side portion 11 may be vertical and the right surface of the first side portion 11 may be parallel to the outer surface of the first sidewall 131 of the deformable portion 13 so that the first piezoelectric element 21 can apply a stable and uniform force to the deformable portion 13. However, the present disclosure is not limited thereto. For example, the right surface of the first side portion 11 may be vertical, and the left end of the first piezoelectric element 21 may have a flat end surface parallel to the right surface of the first side portion 11.

[0050] 1, the right surface of the second side portion 12 may be vertical and the left surface of the second side portion 12 may be parallel to the outer surface of the second side arm 132 of the deformable portion 13 so that the second piezoelectric element 22 can apply a stable and uniform force to the deformable portion 13. However, the present disclosure is not limited thereto. For example, the left surface of the second side portion 12 may be vertical, and the right end of the second piezoelectric element 22 may have a flat end surface parallel to the left surface of the second side portion 12.

[0051] Furthermore, the first piezoelectric element 21 is bonded to the frame 1 and the deformable portion 13, and the second piezoelectric element 22 is bonded to the frame 1 and the deformable portion 13. For example, the left end of the first piezoelectric element 21 is bonded to the first side portion 11 by a hard adhesive, the right end of the first piezoelectric element 21 is bonded to the deformable portion 13 by a hard adhesive, the right end of the second piezoelectric element 22 is bonded to the second side portion 12 by a hard adhesive, and the left end of the second piezoelectric element 22 is bonded to the deformable portion 13 by a hard adhesive.

[0052] As a result, the connections between the first piezoelectric element 21 and the frame 1, the connection between the first piezoelectric element 21 and the deformable portion 13, the connection between the second piezoelectric element 22 and the frame 1, and the connection between the second piezoelectric element 22 and the deformable portion 13 become strong and stable, and since the hard adhesive does not easily absorb the expansion of the first piezoelectric element 21 and the second piezoelectric element 22, the first piezoelectric element 21 and the second piezoelectric element 22 are pressed against the deformable portion 13, thereby enabling the deformable portion 13 to be deformed reliably and effectively.

[0053] Optionally, in a direction perpendicular to the paper surface of FIG. 1, the first piezoelectric element 21 includes multiple laminations, and the second piezoelectric element 22 includes multiple laminations. The number of laminations of the first piezoelectric element 21 is equal to the number of laminations of the second piezoelectric element 22. Each layer of the first piezoelectric element 21 is bonded to the frame 1 and the deformable portion 13, and each layer of the second piezoelectric element 22 is bonded to the frame 1 and the deformable portion 13. For example, the number of laminations of the first piezoelectric element 21 and the number of laminations of the second piezoelectric element 22 are 15. However, the present disclosure is not limited thereto.

[0054] In some embodiments of the present disclosure, a first end of the first side arm 131 and a first end of the second side arm 132 are connected to the body 15, and a bottom arm 133 is connected between a second end of the first side arm 131 and a second end of the second side arm 132.

[0055] As shown in Figures 1 and 2, the first side arm 131 and the second side arm 132 extend diagonally downward from the main body 15, the bottom arm 133 is arranged horizontally, a first end of the first side arm 131 is the upper end of the first side arm 131, a second end of the first side arm 131 is the lower end of the first side arm 131, a first end of the second side arm 132 is the upper end of the second side arm 132, and a second end of the second side arm 132 is the lower end of the second side arm 132, both of the upper end of the first side arm 131 and the upper end of the second side arm 132 are connected to the main body 15, the lower end of the first side arm 131 is connected to the left end of the bottom arm 133, and the lower end of the second side arm 132 is connected to the right end of the bottom arm 133.

[0056] It should be noted that the use of "upper" and "lower" herein to represent the orientation of the figures is for ease of understanding the present disclosure and is not to be construed as a limitation on the present disclosure.

[0057] Furthermore, an upper end of the first side arm 131 and an upper end of the second side arm 132 are spaced a first distance apart in the extension direction of the bottom arm 133, and a lower end of the first side arm 131 and a lower end of the second side arm 132 are spaced a second distance apart in the extension direction of the bottom arm 133. The first distance is shorter than the second distance to allow the deformable portion 13 to have a generally triangular or generally "A" shaped shape.

[0058] Therefore, the first side arm 131 and the second side arm 132 can deform almost independently without affecting each other, so as to drive the deformation and movement of the corresponding part of the bottom arm 133 to drive the corresponding actuating part 31.

[0059] Optionally, the top end of the first side arm 131 is connected to the top end of the second side arm 132. Thus, the shape of the first side arm 131, the second side arm 132 and the bottom arm 133 more resembles a triangle.

[0060] As a result, due to the approximately triangular shape or approximately "A" shape of the deformable portion 13, the right end of the first piezoelectric element 21 is lower than the left end of the first piezoelectric element 21, and the left end of the second piezoelectric element 22 is lower than the right end of the second piezoelectric element 22, making it easier for the first piezoelectric element 21 and the second piezoelectric element 22 to act on the deformable portion 13.

[0061] In some embodiments of the present disclosure, as shown in FIGS. 1 and 2 , a first groove 141 is formed at the connection point between the first side arm 131 and the main body 15, a second groove 142 is formed at the connection point between the second side arm 132 and the main body 15, a third groove 143 is formed at the connection point between the first side arm 131 and the bottom arm 133, and a fourth groove 144 is formed at the connection point between the second side arm 132 and the bottom arm 133.

[0062] In addition, the first groove 141, the second groove 142, the third groove 143, and the fourth groove 144 all have an arcuate cross section, which facilitates elastic deformation and reduces rigidity, thereby avoiding local stress concentration. Note that these grooves extend in a direction perpendicular to the paper plane of Figures 1 and 2.

[0063] In this manner, the first side arm 131, the second side arm 132 and the bottom arm 133 are easily deformed without failure.

[0064] In addition, in order to facilitate independent movement of the left and right ends of the bottom arm 133, a fifth groove 145 also having an arc-shaped cross-section may be formed in the central portion of the bottom arm 133, thereby allowing the operating parts 31 provided at the left and right ends of the bottom arm 133 to move independently without affecting each other.

[0065] In some embodiments of the present disclosure, two actuating portions 31 may be provided, the two actuating portions 31 being provided at the second end (lower end) of the first side arm 131 and the second end (lower end) of the second side arm 132, respectively.

[0066] 1 and 2, two actuating portions 31 are provided on the bottom arm 133, adjacent to the second end (lower end) of the first side arm 131 and the second end (lower end) of the second side arm 132, respectively. In other words, the two actuating portions 31 are provided on the left end and the right end of the bottom arm 133, respectively.

[0067] In any of the above cases, the two actuating units 31 are symmetrical with respect to the center line of the bottom arm 133 that is perpendicular to the extension direction of the bottom arm 133. In other words, the center line of the bottom arm 133 is vertical. Furthermore, the first piezoelectric element 21 can drive and move the movable member 5 of the piezoelectric drive system 1000 by the actuating unit 31 on the left side, and the second piezoelectric element 22 can drive and move the movable member 5 of the piezoelectric drive system 1000 by the actuating unit 31 on the right side.

[0068] Therefore, a large movement of the movable member 5 of the piezoelectric driving system 1000 can be realized by a small deformation of the deformable portion 13. In other words, a small expansion of the first piezoelectric element 21 or the second piezoelectric element 22 can generate a large movement of the movable member 5 of the piezoelectric driving system 1000. Therefore, high driving efficiency can be realized.

[0069] In some embodiments of the present disclosure, one actuating part 31 may be provided, and the one actuating part 31 may be provided on the bottom arm 133. Preferably, the one actuating part 31 is provided at the center of the surface of the bottom arm 133. Therefore, the one actuating part 31 can be used by both the first piezoelectric element 21 and the second piezoelectric element 22 to realize the opposite movement of the movable member 5 of the piezoelectric driving system 1000, which can save materials and reduce costs.

[0070] Moreover, the above embodiments of the settings of the actuators 31 may be arbitrarily combined without conflict. For example, three actuators 31 may be provided, with one actuator 31 provided on the bottom arm 133 and the other two actuators 31 provided on the lower end of the first side arm 131 and the lower end of the second side arm 132, respectively, or provided on the bottom arm 133 adjacent to the lower end of the first side arm 131 and the lower end of the second side arm 133, respectively.

[0071] In some embodiments of the present disclosure, the actuating portion 31 protrudes from the bottom arm 133 of the deformable portion 13 and has a part-spherical shape.

[0072] Therefore, the surface of the actuating portion 31 is spherical so as to have a stable contact with the movable member 5 of the piezoelectric drive system 1000 , thereby ensuring a stable movement of the movable member 5 of the piezoelectric drive system 1000 .

[0073] Furthermore, the frame 1 is made of a ceramic material, the actuating part 31 is also made of a ceramic material, and the deformable part 13 of the frame 1 is integrally molded with the actuating part 31. Since the ceramic material has excellent wear resistance, the frame 1 and the actuating part 31 have a long life. Since the frame 1 is integrally molded with the actuating part 31, it is easy to process and the connection strength between them can be guaranteed.

[0074] An embodiment of the present disclosure further provides a piezoelectric driving system 1000, as shown in Fig. 3. The piezoelectric driving system 1000 includes a piezoelectric driving device 100 according to any of the above embodiments, a holding spring 4, and a movable member 5. The movable member 5 is configured to cooperate with an actuating portion 31 of the piezoelectric driving device 100 and move when driven by the actuating portion 31. The holding spring 4 is provided in the piezoelectric driving device 100 and configured to hold the piezoelectric driving device 100 so as to press the actuating portion 31 against the movable member 5.

[0075] In some embodiments of the present disclosure, the retaining spring 4 has an open rectangular shape to surround the piezoelectric drive device 100 therein, and includes a flange 41 surrounding the opening, and the flange 41 of the retaining spring 4 is fixed. The retaining spring 4 further has a bottom 42 facing the opening. The bottom 42 of the retaining spring 4 deforms toward the frame 1 of the piezoelectric drive device 100, and is connected to the frame 1 of the piezoelectric drive device 100 by bonding or caulking. Thus, the retaining spring 4 can apply pressure to the piezoelectric drive device 100 to press the actuating portion 31 against the movable member 5. For example, the pressure applied by the retaining spring 4 is about 200 mN.

[0076] 3, the movable member 5 is also surrounded by the retaining spring 4, but the present disclosure is not limited thereto. For example, at least a portion of the movable member 5 may be provided outside the retaining spring 4.

[0077] In some embodiments of the present disclosure, when the outer circumferential surface of the movable member 5 is flat, the actuator 31 drives the movable member 5 to translate, and when the outer circumferential surface of the movable member 5 is curved, the actuator 31 drives the movable member 5 to rotate.

[0078] Next, the operating process of the piezoelectric driving system 1000 will be briefly described using the first piezoelectric element 21 as an example, as shown in Figures 1 and 2, in which two actuating parts 31 are provided on the bottom arm 133 and adjacent to the lower end of the first side arm 13 and the lower end of the second side arm 132, respectively.

[0079] When energized, the first piezoelectric element 21 expands in a direction perpendicular to the first side arm 131 of the deformable part 13. During expansion, the first piezoelectric element 21 presses against the deformable part 13 in a direction perpendicular to the first side wall 131 of the deformable part 13, causing the first side wall 131 of the deformable part 13 to deform rightward and downward, after which the first side wall 131 drives the bottom arm 133 to deform and move rightward and downward, and the bottom arm 133 further drives the actuating part 31 adjacent to the lower end of the first side wall 131 to move rightward and downward. The actuating part 31 abuts against the movable member 5 to apply a driving force to the movable member 5. The driving force applied to the actuating part 31 has a right component and a lower component. Therefore, the movable member 5 is driven to move rightward. However, during the above-mentioned expansion process of the first piezoelectric element 21, since the second piezoelectric element 22 is not energized, the second side arm 132 of the deformable portion 13 does not deform, and therefore, another actuating portion 31 adjacent to the lower end of the second side arm 132 does not move.

[0080] In the event of a power failure, the first piezoelectric element 21 contracts, thereby driving the actuating part 31 to move leftward and upward. The direction perpendicular to the first side arm 131 of the deformable part 13 and the extension direction of the bottom arm 133 of the deformable part 13 intersect at a first angle θ1, and since the first angle θ1 ranges from 24 degrees to 26 degrees, the actuating part 31 moving leftward and upward cannot apply a driving force to the movable member 5. Microscopically, the actuating part 31 moving leftward and upward is even separated from the movable member 5. Therefore, the movable member 5 is held in its position without moving together with the actuating part 31. In this manner, the piezoelectric driving system 1000 completes one movement cycle. A periodic pulse signal can be applied to the first piezoelectric element 21, which allows the first piezoelectric element 21 to alternately complete a movement of expanding when energized and contracting when power is lost. As the movement cycle is repeated, the movable member 5 is continuously moved rightward by the drive of the actuating part 31.

[0081] The operation process of the second piezoelectric element 22 is basically the same as the operation process of the first piezoelectric element 21, except that the moving direction of the movable member 5 during the operation of the first piezoelectric element 21 is opposite to the moving direction of the movable member 5 during the operation of the second piezoelectric element 22. For example, the first piezoelectric element 21 drives the movable member 5 to move to the right, and the second piezoelectric element 22 drives the movable member 5 to move to the left. In some other embodiments of the present disclosure, the first piezoelectric element 21 can drive the movable member 5 to move clockwise, and the second piezoelectric element 22 can drive the movable member 5 to move counterclockwise. Also, in the same time period, only one of the first piezoelectric element 21 and the second piezoelectric element 22 operates. In other words, the first piezoelectric element 21 and the second piezoelectric element 22 operate to repel each other.

[0082] According to the above-described embodiment of the present disclosure, the piezoelectric driving system 1000 has advantages such as a simple structure, easy control, and high driving efficiency.

[0083] In the description of the present disclosure, unless otherwise specified and limited, the terms "attached", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a removable connection, or it may be integral. It may be a mechanical connection or an electrical connection. It may be a direct connection, an indirect connection through an intermediate medium, or an internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in the present disclosure according to the specific situation.

[0084] In this specification, a description referring to terms such as "embodiment," "specific embodiment," "example," and the like means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, general expressions for the above terms may not necessarily be made for the same embodiment or example. In addition, the specific features, structures, materials, or advantages described may be combined in an appropriate manner in any one or more embodiments or examples. In addition, a person skilled in the art may combine or combine different embodiments or examples described in this specification.

[0085] Although the embodiments of the present disclosure have been shown and described above, those skilled in the art may make changes, modifications, substitutions, and variations in the embodiments without departing from the principles and scope of the present disclosure. The scope of the present disclosure is limited by the claims and their equivalents.

Claims

1. A piezoelectric driving device, a frame including a deformable portion, the deformable portion including a first side arm, a second side arm opposite the first side arm, and a bottom arm connecting the first side arm and the second side arm, the first side arm and the second side arm being inclined toward each other relative to the bottom arm; a first piezoelectric element and a second piezoelectric element, the first piezoelectric element being disposed between the frame and the first side arm of the deformable portion and the second piezoelectric element being disposed between the frame and the second side arm of the deformable portion, the first piezoelectric element and the second piezoelectric element being configured to deform the deformable portion; An actuating portion provided on the bottom arm of the deformable portion and configured to move when driven by deformation of the deformable portion. Piezoelectric drive.

2. the first piezoelectric element has a first end connected to the frame and a second end connected to the first side arm of the deformable portion, the first piezoelectric element being configured to expand or contract to deform the deformable portion; the second piezoelectric element has a first end connected to the frame and a second end connected to the second side arm of the deformable portion, the second piezoelectric element being configured to expand or contract to deform the deformable portion.

2. The piezoelectric drive device according to claim 1.

3. a second end of the first piezoelectric element matches in shape and orientation to the first side arm of the deformable portion, and a second end of the second piezoelectric element matches in shape and orientation to the second side arm of the deformable portion; a direction perpendicular to a first side arm of the deformable portion intersects with an extension direction of the bottom arm of the deformable portion at a first angle, and a direction perpendicular to a second side arm of the deformable portion intersects with an extension direction of the bottom arm of the deformable portion at a second angle; 3. The piezoelectric drive device according to claim 2.

4. The frame is The main body, a first side and a second side respectively extending from opposite ends of the body; the deformable portion extends from a central portion of the body and is located between the first side portion and the second side portion, the deformable portion forms a first gap and a second gap with the first side portion and the second side portion, respectively, the first piezoelectric element is provided in the first gap, the second piezoelectric element is provided in the second gap, a first end of the first piezoelectric element is connected to the first side portion, and a first end of the second piezoelectric element is connected to the second side portion; 3. The piezoelectric drive device according to claim 2.

5. a first end of the first side arm and a first end of the second side arm are connected to the body, and the bottom arm is connected between a second end of the first side arm and a second end of the second side arm; a first end of the first side arm and a first end of the second side arm are spaced a first distance apart in an extension direction of the bottom arm, and a second end of the first side arm and a second end of the second side arm are spaced a second distance apart in an extension direction of the bottom arm; the first distance is less than the second distance such that the deformable portion has a generally triangular shape or a generally "A" shape; The piezoelectric driving device according to any one of claims 1 to 4.

6. a first groove is formed at a connection point between the first side arm and the main body, a second groove is formed at a connection point between the second side arm and the main body, a third groove is formed at a connection point between the first side arm and the bottom arm, and a fourth groove is formed at a connection point between the second side arm and the bottom arm.

6. The piezoelectric drive device according to claim 5.

7. There are two actuating portions provided at the second end of the first side arm and at the second end of the second side arm, respectively; or two actuating portions are provided on the bottom arm adjacent the second end of the first side arm and adjacent the second end of the second side arm, respectively; 6. The piezoelectric drive device according to claim 5.

8. The two operating parts are symmetrical with respect to a center line of the bottom arm perpendicular to the extension direction of the bottom arm.

8. The piezoelectric drive device according to claim 7.

9. There is provided one actuating portion provided on the bottom arm. The piezoelectric driving device according to any one of claims 1 to 4.

10. The actuation portion protrudes from the bottom arm of the deformable portion and has a part-spherical shape. The piezoelectric driving device according to any one of claims 1 to 4.

11. the first piezoelectric element and the second piezoelectric element are configured to operate in a d33 mode; The piezoelectric driving device according to any one of claims 1 to 4.

12. A first angle range between a direction perpendicular to the first side arm of the deformable portion and an extension direction of the bottom arm of the deformable portion is 24 degrees to 26 degrees, and a second angle range between a direction perpendicular to the second side arm of the deformable portion and an extension direction of the bottom arm of the deformable portion is 24 degrees to 26 degrees. The piezoelectric driving device according to any one of claims 1 to 4.

13. the deformable portion is set in a central portion of the frame and has a symmetrical structure, the first side arm and the second side arm are symmetrical to each other, the first piezoelectric element is symmetric to the second piezoelectric element with respect to an axis of symmetry of the deformable portion, and a first angle and a second angle are equal; The piezoelectric driving device according to any one of claims 1 to 4.

14. the frame is formed of a ceramic material, the actuating portion is formed of a ceramic material, and the deformable portion of the frame is integrally molded with the actuating portion; The piezoelectric driving device according to any one of claims 1 to 4.

15. the first piezoelectric element is bonded to the frame and the deformable portion, and the second piezoelectric element is bonded to the frame and the deformable portion; The piezoelectric driving device according to any one of claims 1 to 4.

16. 1. A piezoelectric drive system comprising: A piezoelectric driving device according to any one of claims 1 to 4, a movable member configured to engage with the actuator of the piezoelectric drive device and move when driven by the actuator; a retaining spring provided in the piezoelectric drive device and configured to retain the piezoelectric drive device so as to press the actuation portion against the movable member; Piezoelectric drive system.

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